How to get tag value xml in laravel 5.7

I want to get value in xml tag, how to do that?. I got an error with xml format when i run it using Guzzle 6 in laravel 5.7.

When i execute $res = $response->getBody()->getContents(); , i got error in xml like this :

<?xml version="1.0" ?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    <SOAP-ENV:Body >
        <SOAP-ENV:Fault  >
            <faultcode>SOAP-ENV:Client</faultcode>
            <faultstring>Client Error</faultstring>
            <detail>
                <ResponseStatus>F</ResponseStatus>
                <ResponseCode>2013</ResponseCode>
                <ResponseText>Error while executing the request:
com.splwg.shared.common.ApplicationError: (Server Message)
    Category: 9
    Number: 260
    Call Sequence: ;CIPOFALR;CIPOFALL;CIPOFACP
    Program Name: CIPOFACP
    Text: Field Activity ID 2445500899 Sequence 030 combination, duplicate key error
    Description: This set of fields is a key on a database table. The combination of values as they currently stand is a duplication of an existing combination.
    Table: CI_FA_LOG
    Field: </ResponseText>
                <ResponseData parm2="2445500899"  parm4="030"  text="Field Activity ID 2445500899 Sequence 030 combination, duplicate key error"  category="9"  parm3="Sequence"  numParm="4"  parm1="Field Activity ID"  number="260"  />
            </detail>
        </SOAP-ENV:Fault>
    </SOAP-ENV:Body >
</SOAP-ENV:Envelope>

How to get value tag <ResponseStatus>, ResponseCode, and ResponseText ?

via Chebli Mohamed